"Great idea - a transformer that fit neatly in a consumer unit taking up only the space of 1 x mcb. BUT zero volts output on installation- dead as the proverbial. No current stock in Screwfix so had to install a separate, wall mounted transformer. Unhappy."

"This transformer doesn't fit inside Wylex consumer units with a fixed busbar. It hums quite loudly and vibrates against the casework of whatever unit it's installed in. I changed it for another (the 12v version this time) and had the same vibration problem. Gave up and bought a Siemens which is almost silent and superior in every way."